The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 2000
Filed:
Nov. 25, 1997
Hiroto Itoi, Kyoto, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
In an inventive ion detector, a cylindrical conversion electrode and an electron multiplier are disposed on a vertical axis intersecting an incidence axis of an ion beam at a right angle. The space between the conversion electrode and the electron multiplier is enveloped by a shield electrode having a cylindrical body with its central axis on the vertical axis. By such a configuration, the electric field which is symmetrical with respect to the vertical axis is generated in the above space, so that secondary electrons or positive ions emitted from the conversion electrode as a result of a secondary emission, travel toward the electron multiplier, converging in proximity to the vertical axis. Thus, most of the secondary electrons or positive ions are led to the electron multiplier with its entrance placed on the vertical axis.